Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

14.25.3 Brick Masonry Chamber : After fixing and testing gully and branch drain, a brickmasonry chamber 300 x 300mm (inside) in brick work of specified class incement mortar 1:4 (1 cement : 4 fine sand) shall be built with a half brick thickbrick work round the gully trap from the top of the bed concrete up to groundlevel. The space between the chamber wall and the trap shall be filled in thewith cement concrete 1:5:10 (1 cement : 5 fine sand: 10 graded stoneaggregate 40mm nominal size). The upper portion of the chamber i.e. abovethe top level of the trap shall be plastered inside with cement mortar 1:3 (1cement : 3 coarse sand), finished with a floating coat of neat cement. Thecorners and bottom of the chamber shall be rounded off so as to slope towardsthe grating.C.I. cover with frame 300 x 300 mm (inside) shall then be fixed on the top ofthe brick masonry with cement concrete 1:2:4 (1 cement : 2 coarse sand : 4graded stone aggregate 20mm nominal size) and rendered smooth. Thefinished top of cover shall be left about 4 cm above the adjoining ground levelso as to excluded the surface water from entering the gully trap.14.25.4 Measurement: The work shall be enumerated. Excavation shall be measuredseparately under relevant item of earth work.14.25..5 Rate : The rate shall include the cost of materials and labour involved in all theoperations described above, except earth work which shall be paid forseparately.14.26 Measurement14.26.1 Manhole shall be enumerated under relevant items. The depth of the manholeshall be reckoned from the top level of C.I. cover to the invert level of channel.The depth shall be measured correct to a cm. The extra depth shall bemeasured and paid as extra over the specified depth.14.26.2 The manhole covers shall be enumerated under relevant items.14.27 RatesThe rate shall include the cast of the material and labour involved in all theoperation described in the item.Urban Administration & Development Department Page 174